Controlling winding tension to reduce tape pack stress

Details Controlling winding tension to reduce tape pack stress Controlling winding tension to reduce tape pack stress

2005-07-19

2005-07-19

Nguyen, John Q. (Department: 3654)

Winding, tensioning, or guiding

Unwinding and rewinding a machine convertible information...

Carrier speed or tension control

C360S071000

Reexamination Certificate

active

06918553

ABSTRACT:
In general, the invention is directed to techniques for reducing deformation of tape in data tape cartridges during storage to promote dimensional stability and increased tape longevity. The techniques involve controlling the winding tension applied to a tape during a final winding pass prior to unloading a data tape cartridge containing the tape from a drive. Excessive winding tensions can produce strain and compression on a tape pack, causing the tape to deform over time. Applications of reduced winding tension during the final pass provide reduced tape pack tension during periods in which the data tape cartridge is not used.

REFERENCES:
patent: 4696439 (1987-09-01), Sukigara et al.
patent: 5012989 (1991-05-01), Whyte, Jr. et al.
patent: 6480357 (2002-11-01), Rambosek
patent: 2002/0166913 (2002-11-01), Ridl et al.
patent: 0 854 480 (1998-07-01), None
Mathur et al., “Controller Development for a Prototype High-Speed Low-Tension Tape Transport,”IEEE Transactions on Control Systems Technology, vol. 6, No. 4, pp. 534-542, Jul., 1998.

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